US6411262B1 - Shaped reflector antenna system configuration for use on a communication satellite - Google Patents
Shaped reflector antenna system configuration for use on a communication satellite Download PDFInfo
- Publication number
- US6411262B1 US6411262B1 US09/643,269 US64326900A US6411262B1 US 6411262 B1 US6411262 B1 US 6411262B1 US 64326900 A US64326900 A US 64326900A US 6411262 B1 US6411262 B1 US 6411262B1
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- United States
- Prior art keywords
- shaped reflector
- antenna
- reflector antenna
- shaped
- diverged
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/02—Details
- H01Q19/021—Means for reducing undesirable effects
- H01Q19/028—Means for reducing undesirable effects for reducing the cross polarisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/288—Satellite antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
- H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
- H01Q19/192—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface with dual offset reflectors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S343/00—Communications: radio wave antennas
- Y10S343/02—Satellite-mounted antenna
Definitions
- the present invention relates generally to reflector antenna systems, and more particularly, to a shaped reflector antenna system for use on a communication satellite.
- the assignee of the present invention deploys communication satellites containing communications systems. Gregorian reflector antenna systems are typically used on such communication satellites. Although the assignee of the present invention has investigated numerous antenna configurations for use on satellites that it has developed, the use of two types of shaped reflector antenna systems for reducing the cross polarization level on a satellite has heretofore not been addressed.
- the present invention provides for a shaped reflector antenna system configuration for use on a communication satellite.
- the present invention addresses types and arrangements of shaped reflector antennas that are used in the shaped reflector antenna system used on the communication satellite to improve the communication system performance.
- An exemplary antenna system comprises a plurality of shaped reflector antenna types.
- a first one of the antenna types is a diverged shaped reflector antenna and a second one of the antenna types is a converged shaped reflector antenna.
- Each of the shaped reflector antennas comprise a main reflector, a subreflector, and at least one feed horn. The feed horn illuminates the subreflector with RF energy in the shape of a feed cone that is reflected to the main reflector.
- the direction of RF energy propagation emitted by each of the shaped reflector antennas is in a direction that is generally different from a direction defined by a vector between a predetermined vertex and focal point associated with the respective shaped reflector antenna.
- the direction of the coverage for the diverged shaped reflector antenna is counterclockwise with respect to a direction defined by a vector between a predetermined vertex and focal point associated with the diverged shaped reflector antenna.
- the direction of the coverage for the converged shaped reflector antenna is clockwise with respect to a direction defined by a vector between a predetermined vertex and focal point associated with the converged shaped reflector antenna.
- the shaped reflector antenna configurations described in the present invention exhibit a reduced cross polarization level, and thus will improve the performance of a communication system in which they are employed.
- the shaped reflector antenna system configuration is intended for use on an LS2020TM satellite developed by the assignee of the present invention.
- FIG. 1 a illustrates a diverged shaped reflector antenna configuration that may be employed in the present invention
- FIG. 1 b illustrates a converged shaped reflector antenna configuration that may be employed in the present invention
- FIG. 2 illustrates an exemplary shaped reflector antenna system in accordance with the principles of the present invention disposed on a satellite;
- FIG. 3 illustrates a classical Gregorian reflector antenna system
- FIG. 4 a illustrates an exemplary direction of coverage for which the diverged shaped reflector antenna configuration is employed in the present invention
- FIG. 4 b illustrates an exemplary direction of coverage for which the converged shaped reflector antenna configuration is employed in the present invention
- FIG. 5 illustrates an exemplary geosynchronous satellite having a shaped reflector antenna system in accordance with the principles of the present invention disposed thereon along with the exemplary antenna beam coverage provided thereby;
- FIG. 6 illustrates a satellite employing the shaped reflector antenna system along with directions of the exemplary coverage area relative to shaped reflector antennas.
- FIGS. 1 a and 1 b illustrate side views of exemplary reflector antenna configurations 10 comprising diverged and converged shaped reflector antennas 10 a , 10 b , respectively, that may be employed in the present invention.
- the diverged and converged shaped reflector antennas 10 a , 10 b each include a main reflector 11 , a subreflector 12 , and a feed horn 13 .
- the feed horn 13 illuminates the subreflector 12 with RF energy in the shape of a feed cone 14 which is in turn reflected to the main reflector 11 .
- the main reflector 11 reflects the feed cone 14 to produce a beam of RF energy on the earth, for example.
- the main reflector 11 diverges outgoing RF energy as shown in FIG. 1 a .
- the main reflector converges the outgoing RF energy as shown in FIG. 1 b.
- FIG. 2 it illustrates an exemplary shaped reflector antenna system 20 in accordance with the principles of the present invention that disposed on a satellite 30 .
- a communication satellite 30 usually carries more than two reflector antennas 10 .
- the exemplary shaped reflector antenna system 20 of the present invention includes a plurality of shaped reflector antennas 10 a , 10 b , identified generally as antennas A, B, C and D.
- the antennas may comprise diverged or converged shaped reflector antenna configurations 10 a , 10 b.
- Selected ones of the shaped reflector antenna configurations 10 comprise either the diverged or converged shaped reflector antennas 10 a , 10 b shown in FIG. 1 a or 1 b respectively.
- the shaped dual reflector antennas 10 a , 10 b shown in FIGS. 1 a and 1 b evolved from a classical Gregorian dual reflector antenna 10 c shown in FIG. 3 .
- the main reflector 1 a of the classical Gregorian reflector antenna 10 c is a sector of paraboloid.
- the main reflector in the shaped reflector antenna configurations 10 a , 10 b is a distorted sector of paraboloid, shaped to distribute the RF energy where it is desired.
- the classical Gregorian reflector antenna 10 c comprises a paraboloidal main reflector 11 a , a subreflector 12 , and a feed horn 13 .
- the feed horn 13 illuminates the subreflector 12 with energy in the shape of a feed cone 14 which is in turn reflected to the paraboloidal main reflector 11 a .
- the paraboloidal main reflector 11 a reflects the feed cone 14 to produce a beam on the earth.
- Point O and point F shown in FIG. 3 correspond to the vertex and focal point of the paraboloidal main reflector 1 la, respectively.
- the vector “OF” is customarily defined as the +z axis of the antenna 10 .
- the +x axis of the Gregorian antenna 10 c is also shown in FIG. 3 .
- the +z axis also represents the direction of RF energy propagation emitted by the classical Gregorian reflector antenna 10 c.
- FIG. 4 a illustrates an exemplary direction of coverage for which the diverged shaped reflector antenna 10 a is employed in the system 20 of FIG. 2
- FIG. 4 b illustrates an exemplary direction of coverage for which the converged shaped reflector antenna 10 b is employed in the system 20 of FIG. 2 .
- FIG. 4 a illustrates an exemplary direction of coverage for which the diverged shaped reflector antenna 10 a is employed in the system 20 of FIG. 2
- FIG. 4 b illustrates an exemplary direction of coverage for which the converged shaped reflector antenna 10 b is employed in the system 20 of FIG. 2 .
- FIG. 4 a illustrates an exemplary direction of coverage for which the diverged shaped reflector antenna 10 a is employed in the system 20 of FIG. 2
- FIG. 4 b illustrates an exemplary direction of coverage for which the converged shaped reflector antenna 10 b is employed in the system 20 of FIG. 2 .
- the direction of coverage for the diverged shaped reflector antenna 10 a is counterclockwise (or + ⁇ ) with respect to the +z axis
- the direction of coverage for the converged shaped reflector antenna 10 b is clockwise (or ⁇ ) with respect to the +z axis.
- the shaped reflector antennas 10 a , 10 b that are used are as follows.
- a diverged shaped reflector antenna 10 a is used if the direction of the coverage area is in a counterclockwise direction (i.e., ⁇ ) with respect to the +z axis of the antenna 10 . This is the diverged shaped reflector antenna 10 a shown in FIG. 4 a .
- a converged shaped reflector antenna 10 b is used if the direction of coverage area is in the clockwise direction (i.e., ⁇ ) with respect to the +Z axis of the antenna 10 . This is the converged shaped reflector antenna 10 b shown in FIG. 4 b.
- FIG. 5 illustrates an exemplary geosynchronous satellite 30 having a shaped reflector antenna system 20 disposed thereon.
- FIG. 5 shows the location of an orbiting satellite 30 and the area to be covered (the antenna beam coverage), which is shown as the continental United States (CONUS).
- CONUS continental United States
- FIG. 6 it illustrates a satellite 30 employing the present shaped reflector antenna system 20 along with exemplary directions of coverage area relative to the shaped reflector antennas 10 (A, B, C, D) used in the system 20 .
- the direction of CONUS is + ⁇ for antenna A and is ⁇ for antenna C.
- antenna A should be a diverged reflector antenna 10 shown in FIG. 1 a
- antenna C should be a converged reflector antenna 10 shown in FIG. 1 b.
- FIG. 1a Antenna A 35.4 dB 28.2 dB Antenna C 29.3 dB 35.4 dB
- antenna A should be a diverged reflector antenna 10 a , shown in FIG. 1 a and antenna C should be a converged reflector antenna 10 b , shown in FIG. 1 b.
Abstract
Description
TABLE 1 |
Exemplary worst case co- to cross-polarization ratio over CONUS |
diverged reflector | converged reflector | ||
FIG. 1a | FIG. 1b | ||
Antenna A | 35.4 dB | 28.2 dB | ||
Antenna C | 29.3 dB | 35.4 dB | ||
Claims (2)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/643,269 US6411262B1 (en) | 2000-08-22 | 2000-08-22 | Shaped reflector antenna system configuration for use on a communication satellite |
JP2001246579A JP2002111372A (en) | 2000-08-22 | 2001-08-15 | Molded reflector antenna system configuration used at communication satellite |
EP01306961A EP1182730A3 (en) | 2000-08-22 | 2001-08-16 | Shaped reflector antenna system configuration for use on a communication satellite |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/643,269 US6411262B1 (en) | 2000-08-22 | 2000-08-22 | Shaped reflector antenna system configuration for use on a communication satellite |
Publications (1)
Publication Number | Publication Date |
---|---|
US6411262B1 true US6411262B1 (en) | 2002-06-25 |
Family
ID=24580081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/643,269 Expired - Lifetime US6411262B1 (en) | 2000-08-22 | 2000-08-22 | Shaped reflector antenna system configuration for use on a communication satellite |
Country Status (3)
Country | Link |
---|---|
US (1) | US6411262B1 (en) |
EP (1) | EP1182730A3 (en) |
JP (1) | JP2002111372A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150311597A1 (en) * | 2014-04-25 | 2015-10-29 | Thales | Array of two twin-reflector antennas mounted on a common support and a satellite comprising this array |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2952238B1 (en) * | 2009-11-03 | 2012-05-04 | Thales Sa | MOBILE BEAM ANTENNA ASSEMBLY |
EP2584650B1 (en) * | 2011-10-17 | 2017-05-24 | MacDonald, Dettwiler and Associates Corporation | Wide scan steerable antenna with no key-hole |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5402137A (en) * | 1992-09-17 | 1995-03-28 | Hughes Aircraft Company | Equalized shaped reflector antenna system and technique for equalizing same |
US5546097A (en) * | 1992-12-22 | 1996-08-13 | Hughes Aircraft Company | Shaped dual reflector antenna system for generating a plurality of beam coverages |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2577074B1 (en) * | 1985-02-05 | 1987-06-26 | Europ Agence Spatiale | MULTI-REFLECTOR ANTENNA WITH CONFORMING BEAM |
EP0284883B1 (en) * | 1987-03-18 | 1992-01-15 | Siemens Aktiengesellschaft | Dual reflector microwave directional antenna |
US5790077A (en) * | 1996-10-17 | 1998-08-04 | Space Systems/Loral, Inc. | Antenna geometry for shaped dual reflector antenna |
-
2000
- 2000-08-22 US US09/643,269 patent/US6411262B1/en not_active Expired - Lifetime
-
2001
- 2001-08-15 JP JP2001246579A patent/JP2002111372A/en active Pending
- 2001-08-16 EP EP01306961A patent/EP1182730A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5402137A (en) * | 1992-09-17 | 1995-03-28 | Hughes Aircraft Company | Equalized shaped reflector antenna system and technique for equalizing same |
US5546097A (en) * | 1992-12-22 | 1996-08-13 | Hughes Aircraft Company | Shaped dual reflector antenna system for generating a plurality of beam coverages |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150311597A1 (en) * | 2014-04-25 | 2015-10-29 | Thales | Array of two twin-reflector antennas mounted on a common support and a satellite comprising this array |
US9590316B2 (en) * | 2014-04-25 | 2017-03-07 | Thales | Array of two twin-reflector antennas mounted on a common support and a satellite comprising this array |
Also Published As
Publication number | Publication date |
---|---|
EP1182730A2 (en) | 2002-02-27 |
EP1182730A3 (en) | 2003-06-11 |
JP2002111372A (en) | 2002-04-12 |
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